JP2726341B2 - Offset blanket for printing - Google Patents

Offset blanket for printing

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Publication number
JP2726341B2
JP2726341B2 JP22187691A JP22187691A JP2726341B2 JP 2726341 B2 JP2726341 B2 JP 2726341B2 JP 22187691 A JP22187691 A JP 22187691A JP 22187691 A JP22187691 A JP 22187691A JP 2726341 B2 JP2726341 B2 JP 2726341B2
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Japan
Prior art keywords
ink
layer
blanket
printing
offset blanket
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JP22187691A
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Japanese (ja)
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JPH04357095A (en
Inventor
誠二 伴野
俊一 荻田
康彦 近藤
敏生 鎌田
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住友ゴム工業 株式会社
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Priority to JP40040790 priority
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Priority to JP22187691A priority patent/JP2726341B2/en
Publication of JPH04357095A publication Critical patent/JPH04357095A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02Blanket structure
    • B41N10/04Blanket structure multi-layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/02Top layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/909Resilient layer, e.g. printer's blanket
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31652Of asbestos
    • Y10T428/31667Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31826Of natural rubber
    • Y10T428/31833Next to aldehyde or ketone condensation product or addition polymer from unsaturated monomers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/31935Ester, halide or nitrile of addition polymer

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing offset blanket used for offset printing.

[0002]

2. Description of the Related Art In the case of a printed material, such as a filter or a display printing device, in which an ink layer printed on a transparent substrate surface is viewed with transmitted light, the thickness of the ink layer varies. If there is, it will appear as a difference in color density, so that the ink layer needs to have a substantially uniform film thickness.

However, in the case of offset printing using an offset blanket, a considerable portion of the ink transferred from the plate to the surface of the blanket remains on the surface of the blanket without being transferred to the surface of the substrate. However, there is a problem that unevenness due to cohesive failure occurs in the ink layer, resulting in a large variation in the film thickness, and the printing edge cannot be reproduced clearly.

[0004] A usual printing offset blanket has a surface printing layer provided on a support layer having or not having a porous compressible layer therein. As the surface printing layer, a rubber material having high oil resistance, mainly an acrylonitrile-butadiene copolymer (NB)
R) is used. However, when high-speed printing is performed using such a normal offset blanket, an adhesive force is generated between the paper and the blanket, which may cause a problem that the paper is curled or torn. A similar problem occurs when printing a smooth substrate such as coated paper. These are phenomena that occur because of poor so-called paper discharge properties (paper separation properties). If such a trouble occurs, the productivity is greatly reduced, so that the blanket is required to have a good paper discharge property.

[0005] In the conventional offset blanket, in order to improve the paper discharging property, a method of changing the surface polishing method of the surface printing layer to roughen the polished surface, a method of including starch in the surface printing layer to reduce the vulcanized starch. A method of dissolving in a solvent for extraction (Japanese Patent Publication No. 3-238), a method of irradiating the surface of the surface printing layer with ultraviolet rays (Japanese Patent Application Laid-Open No. 51-37706), and a method of chlorinating the surface (Japanese Patent Publication No. 47-47). No.-51729) has been proposed.

However, in the method of roughening the surface shape or the method of providing pores on the surface, the contact area with paper is reduced, the dot shape is deteriorated, and the dot reproducibility is reduced. Further, in the method of chlorinating the surface, minute cracks are generated on the surface of the surface printing layer, and as a result, dot reproducibility, cleaning property, and the like deteriorate. Furthermore, the surface treatment method using ultraviolet rays
Although it is effective for improving the paper discharge property and has good dot reproducibility, there is a problem that ultraviolet irradiation equipment is required and strict control of the irradiation amount is required.

[0007] In addition to paper discharge properties, paper dust that accumulates on the offset blanket due to long-time printing is also a major problem. In other words, resource saving and recycling are progressing, and the ratio of using recycled paper is increasing year by year. However, since the quality of recycled paper is deteriorated, paper dust is easily generated. When paper dust accumulates on the offset blanket, problems such as a decrease in print quality and an increase in the number of cleaning steps occur. In order to reduce the generation of such paper dust,
It is effective to make the surface of the surface printing layer rough like the paper discharge property, but it is difficult to reduce the paper dust remaining property so as not to impair the dot reproducibility.

The present invention has been made in view of the above circumstances, and has an improved paper discharge property, a small amount of residual paper dust, an excellent ink transfer property to a transparent substrate, and a halftone dot reproduction. An object of the present invention is to provide a printing offset blanket having excellent properties.

[0009]

Means for Solving the Problems and Actions In order to solve the above problems, the present inventors have conducted various studies on rubber materials constituting the surface printing layer of the offset blanket. As a result, it was considered that the use of silicone rubber having a low surface tension and being hardly wetted by ink would reduce the amount of ink remaining on the surface of the blanket at the time of printing, thereby solving the above problem.

[0010] However, when the surface printing layer is formed only of the silicone rubber, the transferability of the ink from the plate to the blanket (ink transfer) becomes extremely poor. There has been a problem that a problem such as blurring of an edge occurs, and in a severe case, printing is blurred. In addition, since the silicone rubber has poor oil resistance, there is a problem that the silicone rubber is easily deteriorated and swelled by ink or a solvent for cleaning the ink, and distortion occurs in printing.

Therefore, as a result of further study, it was found that the above-mentioned silicone rubber and acrylonitrile rubber having excellent oil resistance were used.
By blending Tadiene rubber in a specific ratio, it is possible to obtain a surface printing layer that is excellent in transferability of the ink from the blanket to the substrate, transferable from the plate to the blanket, and has excellent oil resistance. I found it. Also, Acryloni
The surface printing layer obtained by using a mixture in which the tolyl-butadiene rubber and the silicone rubber are mixed at a specific ratio deteriorates the print quality such as oil resistance, halftone dot shape and ink adhesion, or increases the number of steps. As a result, the present inventors have found a new finding that the paper discharging property can be remarkably improved and the paper dust remaining property can be reduced, and the present invention has been completed.

[0012] Therefore, the offset blanket of the present invention comprises silicone rubber and acrylonitrile on a support layer.
Lil-butadiene rubber in a weight ratio of 10/90 to 60 /
A surface printing layer made of a mixture mixed at 40 is provided. The offset blanket of the present invention thus configured has excellent transferability of the ink to the substrate, good transferability from the plate to the blanket, and excellent oil resistance. Furthermore, the offset blanket of the present invention is excellent in the paper discharge property due to the orientation of the silicone rubber, and can reduce the residual paper dust.

In the offset blanket of the present invention,
As the silicone rubber used, various conventionally known silicone rubbers are used.
Of the silicone rubber in the form, similar to ordinary rubber materials
Preferred is a millable silicone rubber that can be handled
Used for The millable silicone rubber is linear
And high degree of polymerization (6000-10000) polyorgano
Siloxane (silicone gum) as the main material,
Silica-based reinforcing fillers, bulking fillers, dispersion accelerators, etc.
It is supplied as a compounded rubber compound. the above
As the silicone gum, methyl vinyl silicone
[(CHTwo= CH) (CHThree) SiO] is the most commonly used
However, in order to improve the physical properties of rubber,
If (CHThree)TwoSiO, (CFThreeCHTwoCHTwo) Si O,
(C6HFive) TwoPolymerized units such as SiO were introduced into the linear chain
Polyorganaxane is also used.

Acrylonitrile-butadiene rubber (NB
R) is commercially available in various grades depending on the amount of acrylonitrile used and the difference in the molecular weight. However, acrylonitrile having an acrylonitrile content of about 30 to 40% is mainly used in view of the balance between oil resistance and ink transferability. Is preferred.

[0015] The silicone rubber and acrylonitrile A - pigs
The compounding ratio with the diene rubber is silicone rubber /
A acrylonitrile - butadiene rubber = 10 / 90-60
By being within the range of / 40, not only the paper discharge property is good, but also the transferability of the respective inks from the plate to the blanket and from the blanket to the base material and the oil resistance are excellent, and the paper Powder residue can also be reduced. That is, the addition amount of silicone rubber is 60% by weight.
When the value exceeds, the transferability of the ink from the plate to the blanket becomes poor, and the amount of the ink becomes insufficient, causing the above-mentioned problems such as the unevenness and the unclear edge, and the printing is blurred. In addition, since the oil resistance is reduced, the surface printing layer is easily deteriorated and swelled by the ink or solvent during printing. On the other hand, when the addition of the silicone rubber is less than 10% by weight, the paper discharging property is deteriorated, and the ink transfer property from the blanket to the base material is also deteriorated.

[0016]

The surface printing layer is made of the above silicone rubber and
Acrylonitrile-butadiene rubber , for example, a vulcanizing agent,
Vulcanization accelerator, vulcanization accelerator aid, a filler, after forming the shape of the compounded rubber obtained by blending various additives into the form of the surface printing layer such as a plasticizer, is formed by vulcanization in a conventional manner.

As the vulcanizing agent contained in the compounded rubber, for example, tetramethylthiuram disulfide (TMT)
D), organic sulfur-containing compounds such as N, N'-dithiobismorpholine, and sulfur. In addition, as a vulcanizing agent,
Organic peroxide-based crosslinking agents can also be used. As the organic peroxide-based crosslinking agent, tert-butyl hydroperoxide, di-tert-butyl peroxide, dicumyl peroxide, tert-butylcumyl peroxide,
1,1-bis (tert-butylperoxy) cyclododecane, 2,2-bis (tert-butylperoxy) octane, 2,5-dimethyl-2,5di (tert-butylperoxy) hexane, 1,3-bis (Tert-butylperoxyisopropyl) benzene, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate.

Examples of the vulcanization accelerator include dibenzothiazyl disulfide (MBTS), N-oxydiethylene-2-benzothiazyl sulfenamide (OBS),
Thiazoles such as -cyclohexyl-2-benzothiazylsulfenamide (CBS) and N-tert-butyl-2-benzothiazylsulfenamide (TBBS) are mentioned as main accelerators; , 3-Diphenylguanidine (DPG), tetramethylthiuram monosulfide (TMTM), zinc dimethyldithiocarbamate (ZnMDC), zinc ethylphenyldithiocarbamate (ZnEPDC), and tetramethylthiuram mentioned as the vulcanizing agent Disulfide (TMTD) etc.
It can be appropriately compounded as a secondary accelerator.

As fillers, inorganic fillers such as calcium carbonate, hard clay, soft clay, hydrous silicic acid, silicic acid anhydride, barium sulfate, diatomaceous earth, talc, mica, asbestos, graphite, pumice stone, etc .; recycled rubber, powdered rubber, asphalt Fillers, styrene resins, and organic fillers such as glue. The offset blanket of the present invention having the above-mentioned surface printing layer is formed, for example, in a layer configuration shown in FIGS.

FIG. 1 shows a structure of a compressible offset blanket in which a surface printing layer 3 is formed on the surface of a support layer 1 including a compressible layer 2 made of a synthetic resin foam or the like. FIG. 2 shows a configuration of a normal offset blanket in which the surface printing layer 3 is directly laminated on the support layer 1. In the offset blankets shown in the above figures, a plurality of (three in the figure) base fabrics 11, 11 are provided.
Are laminated via primer layers (adhesive layers) G, G, so that the support layer 1 is formed.
The surface printing layer 3 is formed on the substrate with a primer layer G interposed therebetween. The thickness of the surface printing layer 3 is not particularly limited, but is preferably 350 μm or less.

In the offset blanket of FIG. 1, in order to prevent the front printing layer 3 from being displaced by pressure during printing and causing printing defects such as displacement of halftone dots and poor registration, the compressibility of the offset blanket is reduced. The base cloth 11 is also interposed between the layer 2 and the surface printing layer 3 via the primer layers G, G. As the base cloth 11, a woven cloth such as a cotton cloth or a rayon cloth is usually used. For example, as shown in FIG. 3, instead of a plurality of base cloths 11, 11,. A sheet body P such as a plastic film, an aluminum foil, and an aluminum plate can also be used. In addition, FIG. 3 shows that, in the layer configuration of FIG. 1, three base fabrics 11, 11.
Although the case where one sheet body P is replaced is shown, it is also possible to replace three base cloths 11, 11... With one sheet body P in the layer configuration of FIG. In this case, it is preferable to form the surface printing layer 3 on the sheet P via the primer layer G as in the case of FIG.

The layer constitution of the offset blanket of the present invention is not limited to those shown in the above drawings, and various conventionally known layer constitutions can be adopted.

[0024]

Example: Investigation of compounding ratio of rubber material Millable silicone rubber (trade name KE manufactured by Shin-Etsu Chemical Co., Ltd.)
8751-U) and NBR (Clinac 803 manufactured by Policer) as an oil-resistant rubber are shown in FIGS.
As shown in the figure, white filler 3 was added to 100 parts by weight of the raw rubber mixed in nine different mixing ratios of 10/90 to 90/10.
0 parts by weight, 30 parts by weight of dioctyl phthalate, 5 parts by weight of zinc oxide, 0.5 parts by weight of stearic acid, AccTT1.
Five parts by weight and 2.5 parts by weight of AccMOR were blended to produce nine types of compounded rubber.

As comparative examples, a compounded rubber using only 100 parts by weight of silicone rubber and a compounded rubber using only 100 parts by weight of NBR were produced in the same manner as described above. Oil resistance test Each compounded rubber was molded, vulcanized and 1mm x 2cm x 2cm
To prepare a block, the block was immersed in toluene which is kept at 40 ° C., and measuring the volume after 24 hours, from the volume V T1 before immersion after immersion in a volume V T2 Prefecture, the following formula , The rate of volume increase due to swelling V T (%) was calculated. FIG. 4 shows the results.

[0026]

(Equation 1)

From the results shown in FIG. 4, it was found that the lower the blending ratio of the silicone rubber, the higher the oil resistance. As shown in FIG. 1, four cotton base cloths 11 and a compressible layer 2 made of foamed polyurethane were laminated via primer layers G made of a rubber-based adhesive. Each of the above-mentioned compounded rubbers was laminated on the surface of the support layer 1 via the primer layer G, and vulcanized to produce an offset blanket having a surface print layer 3 having a thickness of 350 μm.

Each of the above-mentioned offset blankets is set in an ink transfer tester manufactured by Prufbau, and black ink (trade name: Toyo Ink Mark V) manufactured by Toyo Ink is coated with coated paper manufactured by Daio Paper. Use,
Under the following conditions, the ink transfer rate T from the plate to the blanket
1 (%) and the ink transfer rate T 2 (%) of the coated paper from the blanket were measured. FIG. 5 shows the measurement result of the ink transfer ratio T 1 (%) from the plate to the blanket, and FIG. 6 shows the measurement result of the ink transfer ratio T 2 (%) from the blanket to the coated paper.

Test conditions Printing pressure: 600 N Printing speed: 2-4 m / s Roll temperature: 25 ° C. Supply ink amount: 0.522 Environmental temperature: 25 ° C. Environmental humidity: 60% From the results of FIG. there are 6 0 wt% or less of those, ink transfer ratio T 1% from the plate to the blanket, it was almost identical to that of NBR100 wt%. On the other hand , when the mixing ratio of the silicone rubber exceeds 60% by weight, the ink transfer rate T 1 % gradually decreases,
It has been found that when the compounding ratio of the silicone rubber exceeds 80% by weight, the ink transfer rate T 1 % sharply decreases.

On the other hand, from the results shown in FIG. 6, the ink transfer ratio T 2 % from the blanket to the coated paper was NBR1 in all the cases where the blending ratio of the silicone rubber was 10% by weight or more.
It was found to be significantly higher than that of 00% by weight. Observation of density unevenness When the density unevenness of the ink layer on the surface of the coated paper obtained by the measurement of the ink transfer rate was visually observed, a marked density unevenness was observed in the offset blanket using silicone rubber or NBR alone. Was observed, but no noticeable density unevenness was observed in the ink layer in the offset blanket using both of them. In the above-mentioned offset blanket of silicone rubber alone and offset blanket of NBR alone,
Offset blanket of silicone rubber alone is better
Density unevenness was large, and blurring was observed.

EXAMPLE 1 As shown in FIG. 3, one cotton base cloth 11, a compressible layer 2 made of foamed polyurethane, and a polyester film P were combined with a primer layer G made of a rubber-based adhesive. G. A compound rubber having a compounding ratio of 20/80 of silicone rubber and NBR prepared on the surface of the support layer 1 laminated in this order on the base cloth 11 side by examining the compounding ratio of the rubber material. Was also laminated via the primer layer G and vulcanized to produce an offset blanket having a layer configuration shown in FIG. 3 having a surface printing layer 3 having a thickness of 350 μm.

COMPARATIVE EXAMPLE 1 An offset blanket was manufactured in the same manner as in Example 1 except that a rubber compounded with 100% by weight of silicone rubber prepared by studying the mixing ratio of the rubber material was used. Comparative Example 2 Except for using NBR 100% by weight as the compounded rubber, which was produced by examining the compounding ratio of the rubber material,
An offset blanket was manufactured in the same manner as in Example 1 above.

Printing Test 1 The offset blankets of the above Examples and Comparative Examples were
Each of them was loaded into a printing machine for glass plates (Ector 600CL, trade name, manufactured by Komeki Co., Ltd.), and a 300-line original plate and an ultraviolet-curable glass ink (Dai Nippon Ink Co., Ltd.) were used. Line width 20μm, spacing 20μm on the surface
Was printed. Then, the cross-sectional shape of the ink layer constituting the stripe pattern in a direction orthogonal to the stripe pattern was measured by a non-contact type surface profile measuring device (Surface profile analyzer manufactured by Meishin Koki Co., Ltd., trade name: SAS2010). .

The swelling ratio V UV % of the glass ink in the surface printing layer of each offset blanket.
Were, respectively, Example 1 → 9%, Comparative example 1 → 17%, Comparative example 2 → 25%. FIG. 7A shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Example 1 was used, and FIG. 7B shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 1 was used. ),
FIG. 7C shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 2 was used.

From these measurement results, when the offset blanket of Comparative Example 2 having the NBR-only surface printing layer was used, the cross section of the ink layer was uneven, and the cross-sectional shape and height of each ink layer were observed. Was not constant, indicating that unevenness due to cohesive failure occurred in the ink layer. In addition, the shape of both end portions of each ink layer was not constant, which indicated that the edge of each ink layer was unclear.

When the offset blanket of Comparative Example 1 having a surface printing layer of silicone rubber alone was used, no irregularities were observed in the cross section of the ink layer, and the cross-sectional shape and height of each ink layer were almost constant. However, both ends of each ink layer had a gentle curve, indicating that the edges were unclear. On the other hand, when the offset blanket of Example 1 having the surface printing layer made of a mixture of silicone rubber and NBR was used, no irregularities were observed in the cross section of the ink layer, and the cross-sectional shape of each ink layer was not changed. The height was almost constant, indicating that no unevenness due to cohesive failure occurred. In addition, both ends of each ink layer were sharply raised, indicating that the edges of the ink layer were sharp.

Printing Test 2 A cross-sectional shape of the ink layer in a direction perpendicular to the striped pattern was obtained in the same manner as in printing test 1 except that a striped pattern having a line width of 100 μm and an interval of 100 μm was printed on the surface of the glass plate. Was measured. FIG. 8A shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Example 1 was used, and FIG. 8B shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 1 was used. FIG. 8 (c) shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 2 was used.

From these measurement results, when the offset blanket of Comparative Example 2 was used, unevenness was observed in the cross section of the ink layer, and the cross-sectional shape and height of each ink layer were not constant. It was found that unevenness due to cohesive failure occurred in the ink layer. In addition, both end portions of each ink layer protruded outside the predetermined width, which indicated that the edges of the ink layer were unclear.

When the offset blanket of Comparative Example 1 was used, both ends of the ink layer had a gentle curve, and it was found that the edge of the ink layer was unclear. Also, the height of each ink layer is
When the offset blanket of Comparative Example 2 and the offset blanket of Example 1 described later were used, the height of the ink layer was lower. Therefore, when the offset blanket of Comparative Example 1 was used, the ink from the plate to the blanket was used. It was found that the amount of ink was insufficient due to poor transferability of the ink.

On the other hand, when the offset blanket of Example 1 was used, it was found that, as in the printing test 1, no unevenness due to cohesive failure occurred, and the edge of the ink layer was sharp. Printing Test 3 The offset blankets of the above Examples and Comparative Examples were
Each was loaded on the glass plate printing machine, and using a 300-line original plate and the ultraviolet curing type glass ink, the surface of the glass plate was 300 μm long and 250 μm wide.
Printed square dots. Then, the cross section on the long side of the ink layer constituting the square dot was measured by the non-contact type surface profile measuring instrument. FIG. 9A shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Example 1 was used, and FIG. 9B shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 1 was used. FIG. 9C shows the measurement results of the cross-sectional shape of the ink layer when the offset blanket of Comparative Example 2 was used.

From the results shown in the above figures, when the offset blanket of Comparative Example 2 was used, unevenness was observed in the cross section of the ink layer, and it was found that unevenness due to cohesive failure occurred in the ink layer. Was. In addition, both ends of the ink layer protruded outside the predetermined width, which indicated that the edges of the ink layer were unclear.

When the offset blanket of Comparative Example 1 was used, unevenness having a larger wavelength was observed than in the case of Comparative Example 2, and the height of the ink layer was lower than that of Comparative Example 2 and the following Example. Therefore, when the offset blanket of Comparative Example 1 was used, the transferability of the ink from the plate to the blanket was poor, so that the amount of ink was insufficient and unevenness due to cohesive failure occurred. I knew it was done. In addition, both ends of the ink layer had a gentle curve, indicating that the edge of the ink layer was unclear.

On the other hand, when the offset blanket of Example 1 was used, it was found that, as in the printing tests 1 and 2, no unevenness due to cohesive failure occurred and the edge of the ink layer was clear. . Examples 2 to 6 and Comparative Rows 3 and 4 Using the same millable silicone rubber and oil-resistant rubber used in the above compounding ratio study, mixing was performed at the compounding ratio shown in Table 1, and the compounded rubber for the surface printing layer was prepared. Manufactured. That is,
Based on 100 parts by weight of the raw rubber obtained by mixing the silicone rubber and the oil-resistant rubber at the ratios shown in Table 1, 30 parts by weight of a white filler (Nipsil VN30), 20 parts by weight of a plasticizer (dioctyl phthalate), and a crosslinking agent (dic 1 part by weight of milperoxide) and 0.3 part by weight of a crosslinking retarder (Sconock N manufactured by Ouchi Shinko Chemical Co., Ltd.) were added to obtain a compounded rubber for a surface printing layer.

A surface printing layer is applied to the support layer from four cotton base cloths and the compressible layer via a primer according to a conventional method, dried and vulcanized to obtain a 0.3 mm thick sheet. An offset blanket having a surface printing layer was prepared. Printing Test 4 Using each offset blanket obtained in Examples 2 to 9 and Comparative Examples 3 and 4, a printing machine (Ryobi Co., Ltd., 56
(0 type machine). The test conditions are as follows.

P / B pressure: 15/100 mm B / I pressure: 15/100 mm Ink: “Mark V New” manufactured by Toyo Ink Co., Ltd.
Process eye "Paper: High quality paper 70 kg (Daio Paper Co., Ltd.) Coated paper 110 kg (Daio Paper Co., Ltd.) Printing speed: 10,000 sheets / hour The test results are shown in Table 1. Each test result shown in Table 1 was measured by the following method. (1) Halftone dot shape The halftone dot shape was evaluated using the shape factor of the printed halftone dot. The shape factor of a halftone dot is represented by the following equation, and the closer the shape factor is to 1, the better (closer to a perfect circle). In the following formula, the area and the perimeter are determined by image analysis.

[0046]

(Equation 2)

(2) Solid Inlay The solid distribution was examined by image analysis, and the standard deviation was determined to evaluate the solid inlay. That is,
The smaller the standard deviation, the better. (3) Oil resistance In the same manner as described above, a 1 mm × 2 cm × 2 cm block was prepared, immersed in toluene at 40 ° C. for 24 hours, and the volume increase rate V T was calculated. Oil resistance was evaluated. ◎: V T is 120% or less ○: V T is 120% ~150% △: V T is 150% ~175% ×: V T is 175% ~200% ××: V T is 200% or more (4) Paper Ejection The curl height was measured when 10 sheets of coated paper printed in total were stacked. The lower the curl height, the better the paper discharge property. (5) Remaining paper dust The amount of paper dust adhering to the surface of the offset blanket after printing 100,000 sheets was visually evaluated.

The evaluation was performed according to the following criteria. :: Paper dust hardly adhered Δ: Paper dust accumulated near the edge portion ×: Paper dust adhered to the entire surface XX: Remarkable adhesion of paper dust

[0049]

[Table 1]

As is clear from Table 1, as the amount of silicone rubber increases from 10 % by weight (Examples 2 to 5)
6) It can be seen that the paper dust retention and paper discharge were significantly improved, and the solid inking property and the halftone dot shape were also improved. On the other hand, when the amount of the silicone rubber exceeds 60 % by weight (Comparative Example 4), the oil resistance is extremely poor, and the ink transfer from the plate to the blanket is poor, so that the transfer to paper is reduced. As a result, the ink density did not increase and the inking property was poor. From these results, it is understood that the range of silicone rubber / NBR = 10/90 to 60/40 is preferable.

[0051]

As described above, the offset blanket of the present invention has a low surface tension and is hardly wetted by an ink, such as silicone rubber and acrylonitrile having excellent oil resistance.
-10/90 to 60/40 by weight ratio with butadiene rubber
Because the surface printing layer is formed with the mixture mixed in
The transferability of the ink from the blanket to the substrate is excellent, the transferability from the plate to the blanket is good, and the oil resistance is excellent. In addition, according to the present invention, there is an effect that the paper discharging property is improved and the residual paper dust can be reduced.

Accordingly, the offset blanket of the present invention is suitable for printing on a transparent base material such as a filter or display printing, and has excellent suitability for high-speed printing.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating an example of a layer configuration of an offset blanket of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of the layer configuration of the offset blanket of the present invention.

FIG. 3 is a schematic cross-sectional view showing still another example of the layer configuration of the offset blanket of the present invention.

FIG. 4 is a graph showing the relationship between the mixing ratio of silicone rubber and NBR and oil resistance.

FIG. 5 is a graph showing the relationship between the mixing ratio of silicone rubber and NBR and printing characteristics.

FIG. 6 is a graph showing the relationship between the mixing ratio of silicone rubber and NBR and printing characteristics.

FIG. 7A is a graph showing a cross-sectional shape of an ink layer obtained using the offset blanket of Example 1,
FIG. 2B is a graph showing the cross-sectional shape of the ink layer obtained by using the offset blanket of Comparative Example 1, and FIG.
Is a graph showing the cross-sectional shape of the ink layer obtained using the offset blanket of Comparative Example 2,

FIG. 8A is a graph showing a cross-sectional shape of an ink layer obtained by using the offset blanket of Example 1.
FIG. 2B is a graph showing the cross-sectional shape of the ink layer obtained by using the offset blanket of Comparative Example 1, and FIG.
Is a graph showing the cross-sectional shape of the ink layer obtained using the offset blanket of Comparative Example 2,

FIG. 9A is a graph showing a cross-sectional shape of an ink layer obtained by using the offset blanket of Example 1.
FIG. 2B is a graph showing the cross-sectional shape of the ink layer obtained by using the offset blanket of Comparative Example 1, and FIG.
9 is a graph showing a cross-sectional shape of an ink layer obtained by using the offset blanket of Comparative Example 2.

[Explanation of symbols]

 1 support layer 3 surface printing layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshio Kamata 592-1 Takahata, Shikata-cho, Kakogawa-shi, Hyogo (56) References JP-A-1-141,035 (JP, A) JP-A-4-176691 (JP, A)

Claims (1)

(57) [Claims]
1. A silicone rubber and acrylo on a support layer.
Nitrile-butadiene rubber in a weight ratio of 10 / 90-6
A printing offset blanket provided with a surface printing layer made of a mixture of 0/40.
JP22187691A 1990-12-04 1991-09-02 Offset blanket for printing Expired - Lifetime JP2726341B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2-400407 1990-12-04
JP40040790 1990-12-04
JP22187691A JP2726341B2 (en) 1990-12-04 1991-09-02 Offset blanket for printing

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP22187691A JP2726341B2 (en) 1990-12-04 1991-09-02 Offset blanket for printing
US07/801,569 US5264289A (en) 1990-12-04 1991-12-02 Printing offset blanket and rubber roll
DE1991609249 DE69109249T2 (en) 1990-12-04 1991-12-04 Printing blankets for offset printing and rubber roller.
DE1991609249 DE69109249D1 (en) 1990-12-04 1991-12-04 Printing blankets for offset printing and rubber roller.
EP19910311288 EP0489586B1 (en) 1990-12-04 1991-12-04 Printing offset blanket and rubber roll

Publications (2)

Publication Number Publication Date
JPH04357095A JPH04357095A (en) 1992-12-10
JP2726341B2 true JP2726341B2 (en) 1998-03-11

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JP22187691A Expired - Lifetime JP2726341B2 (en) 1990-12-04 1991-09-02 Offset blanket for printing

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US (1) US5264289A (en)
EP (1) EP0489586B1 (en)
JP (1) JP2726341B2 (en)
DE (2) DE69109249D1 (en)

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DE19648494C2 (en) * 1996-11-22 2002-03-07 Novurania S P A Blanket for offset printing
US5860360A (en) * 1996-12-04 1999-01-19 Day International, Inc. Replaceable printing sleeve
USRE38468E1 (en) 1996-12-04 2004-03-23 Day International, Inc. Replaceable sleeve
DE19716424B4 (en) * 1997-04-18 2004-08-26 Koenig & Bauer Ag Device for preventing ink from depositing on cylinders of printing machines
US5974974A (en) * 1997-07-01 1999-11-02 Polyfibron Technologies, Inc. Substantially transparent printing blankets and methods for using same
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US6640711B2 (en) * 2002-01-15 2003-11-04 Michael A. Smoot Bridge mandrel for use as a repeat builder in a printing machine
DE102005050226A1 (en) * 2005-10-20 2007-04-26 Man Roland Druckmaschinen Ag MetalBack
US20080057188A1 (en) * 2006-08-29 2008-03-06 Byers Joseph L Method of making a printing blanket or sleeve including a texturized polyurethane printing surface
EP2105298B1 (en) * 2008-03-28 2014-03-19 FUJIFILM Corporation Negative-working lithographic printing plate precursor and method of lithographic printing using same
EP2106925B1 (en) * 2008-03-31 2012-02-01 Celfa AG Self-adhesive underlay film
AR090178A1 (en) 2012-03-23 2014-10-22 Sicpa Holding Sa Method of printing ink Intaglio oxidative drying and intaglio inks curable by UV-vis
JP6005993B2 (en) * 2012-05-18 2016-10-12 藤倉ゴム工業株式会社 Processing method of blanket for offset printing and manufacturing method of the blanket
CN102729588A (en) * 2012-07-18 2012-10-17 广东宏陶陶瓷有限公司 Durable intaglio printing rubber roller
CN103804732B (en) * 2014-02-21 2015-11-25 河北春风银星胶辊有限公司 The bag coating compound of a kind of UV ink and the dual-purpose printing rubber roll of common ink
JP6106117B2 (en) * 2014-03-12 2017-03-29 藤倉ゴム工業株式会社 blanket
JP6118938B2 (en) * 2016-04-25 2017-04-19 藤倉ゴム工業株式会社 Blanket for offset printing

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Also Published As

Publication number Publication date
DE69109249D1 (en) 1995-06-01
DE69109249T2 (en) 1995-11-23
US5264289A (en) 1993-11-23
EP0489586B1 (en) 1995-04-26
EP0489586A1 (en) 1992-06-10
JPH04357095A (en) 1992-12-10

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